lower Ordovician series的用法和樣例：
例句
- The Lower Ordovician organic reefs were first identified in Huanghuachang of the eastern Yangtze Gorge by the authors.
首次發(fā)現峽東下奧陶統生物礁。 - Shimen Hunan realgar deposit controlled by both dolomite of lower Cambrian Luoshanguao Group, lower Ordovician limestone and fault.
湖南石門(mén)雄黃礦床受寒武系下統婁山關(guān)群白云巖和下奧陶統灰巖以及斷裂構造的雙重控制。
